Trisazo dyes.



nunonr navcwrrz, or ramnmcnsnaonmnnan BERLIN, GERMANY, .a'ssrcnoa soscrim; emsnnnscnsrr run. ANILIN FABRI-KATIOEOF BERLIN, suarcanr.

raisazo DYES.

No Drawing.

To all whom it may concern:

Be it known that I, RUDOLF Hauswlrz, a citizen of the Empire of Germany,residing at Friedrichshagen, near Berlin, Germany,- (my. post-officeaddress being Seestrasse 97, Friedrichshagen, near Berlim' Specificationof Letters Patent.

Application filed July 24, 1916. Serial No. 111,048.

Patented nee, is, iaia.

Germany,) have invented certain new and useful Improvements in. TrisazoDyes, of which the following is a specification,

My present invention relates to new trisazo dyes of the generalconstitution:

The dyeings thus obtained have a good fast ness to light and can bedischarged to a clean white. 4

A process for making the new dyes consists in combining a4.4'-diaminoazo-con1- pound after diazotation-with' one molecularproportion of a 1.8-dioxynaphthalene sulfonic acid and one molecularproportion of ameta-dlamm of the benzene series. This procem may bemodified for instance in that manner that a 4-nitroor4-acidylamino-l-diazoazo-compound is coupled with a I CH30\ Thediaminoazo-dye prcparedin known" manner by coupling the diam-compound of13.8 parts of l-nitranilin with 13.7 parts of3-amino-4-methoxy-l-methylbenzene and reducing the nitro-group isdiazotized by means of 130 parts of hydrochloric acid of 12 ,Bqand 13.8parts'of sodium nitrite, By combining with 36.4 parts of, the sodiumsalt of 1.8-di0xynaphthalene 3.6-disulfonic acid upon the addition of 50parts of sodium acetate the intermediate product is formed which ismixed with a solution of 12 parts of 1.3-phenylcnediamin. The dye isworked as usual. Its constitution is expressed probably by the formula:

NH: UB3.

A similar 'dye is obtained. when l.8-dioxyfonic acid. constitution:

ins- 1 (1 on R'N=N- -(1)---R"(4)--N=N--(1)--R("--(4)N=N-v-(2)-C1H(8)0161 HEN-(3) p I (S fi where-R, R and R mean radicals of the colortheaqueous .solutionsby' addition ofbenzene series, being in the shape oftheir, pulverized dry sodium salts blackish pow .der's, soluble "inwater with a violet color,

in; concentrated sulfuric acid with a blue moss A moana.

Having now described my invention what an allrali becoming bluer, byacidifying the dyes settling out as reddish precipitates;

being destroyed by strong reducing agents;

dyeing cotton-from aqueous solutiousviolet tints which turn to blackafter a treatment with -i-nitrodiuzohmizmie.

2. The new l/Z'lYAZU- UC which derives roin 1. L phenylenediaminazo-il-aminod- CHaO OH OH \w noas Lsogn,

NHz CH being in the shape of its pulverized dry tints, which turn toblack after a treatment.

with 4-nitrodiazoheuzene.

lnitestnnony whereof I affix my signature ll] presence of, twowitnesses.

RUDOLF HAUG-VVITZ.

sodium salt a blackish powder soluble in water with a violet color, inconcentrated sulfuric acid with a blue color; the aqueous solutionbyaddition of an alkali becoming bluer, by acidifying the dye settlingout as a reddish precipitate; being destroyed by strong reducing agents;dyeing cotton violet \Vitnes ses:

HENRY HAsrEn, ALLEN F. JENNINGS.

